"It's a brilliant surface in that sunlight. The horizon seems quite close to you because the curvature is so much more pronounced than here on earth."

"The future of space exploration is not just about going to the Moon, it's about going to Mars and beyond."

"Science has not yet mastered prophecy. We predict too much for the next year and yet far too little for the next 10."

"I put my thumb up and I could hide the whole Earth behind my thumb. I felt like a little tiny speck in this vast universe."

"I think in terms of the future. I think in terms of what we can do, not what we can't do."